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Run results for:
JavaScript spread operator vs Object.assign vs mutation performance with condition #3
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<iframe src="https://measurethat.net/Embed?id=498902" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser:
Chrome 120
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
Using mutation
111.0M/s
Using the spread operator
62.5M/s
Using Object.assign
14.7M/s
View exact numbers
Test name
Executions per second
✓
Using mutation
110,972,104 Ops/sec
Using the spread operator
62,520,356 Ops/sec
Using Object.assign
14,741,729 Ops/sec
Tests:
Using the spread operator
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const conditionState = !secondObject?.moreData const finalObject = { ...firstObject, ...(conditionState ? secondObject : {}) };
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const conditionState = !secondObject?.moreData const finalObject = Object.assign(firstObject, conditionState && secondObject);
Using mutation
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const conditionState = !secondObject?.moreData const finalObject = { sampleData: firstObject.sampleData } if (conditionState) { finalObject.moreData = secondObject.moreData }